import { promises as fs } from 'fs';
import path from 'path';
import os from 'os';
import { FileSystemUtils } from '../../../utils/file-system.js';
/**
 * Installer for Bash completion scripts.
 * Supports bash-completion package and standalone installations.
 */
export class BashInstaller {
    homeDir;
    /**
     * Markers for .bashrc configuration management
     */
    BASHRC_MARKERS = {
        start: '# OPENSPEC:START',
        end: '# OPENSPEC:END',
    };
    constructor(homeDir = os.homedir()) {
        this.homeDir = homeDir;
    }
    /**
     * Check if bash-completion is installed
     *
     * @returns true if bash-completion directories exist
     */
    async isBashCompletionInstalled() {
        const paths = [
            '/usr/share/bash-completion', // Linux system-wide
            '/usr/local/share/bash-completion', // Homebrew Intel (main)
            '/opt/homebrew/etc/bash_completion.d', // Homebrew Apple Silicon
            '/usr/local/etc/bash_completion.d', // Homebrew Intel (alt path)
            '/etc/bash_completion.d', // Legacy fallback
        ];
        for (const p of paths) {
            try {
                const stat = await fs.stat(p);
                if (stat.isDirectory()) {
                    return true;
                }
            }
            catch {
                // Continue checking other paths
            }
        }
        return false;
    }
    /**
     * Get the appropriate installation path for the completion script
     *
     * @returns Installation path
     */
    async getInstallationPath() {
        // Try user-local bash-completion directory first
        const localCompletionDir = path.join(this.homeDir, '.local', 'share', 'bash-completion', 'completions');
        // For user installation, use local directory
        return path.join(localCompletionDir, 'openspec');
    }
    /**
     * Backup an existing completion file if it exists
     *
     * @param targetPath - Path to the file to backup
     * @returns Path to the backup file, or undefined if no backup was needed
     */
    async backupExistingFile(targetPath) {
        try {
            await fs.access(targetPath);
            // File exists, create a backup
            const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
            const backupPath = `${targetPath}.backup-${timestamp}`;
            await fs.copyFile(targetPath, backupPath);
            return backupPath;
        }
        catch {
            // File doesn't exist, no backup needed
            return undefined;
        }
    }
    /**
     * Get the path to .bashrc file
     *
     * @returns Path to .bashrc
     */
    getBashrcPath() {
        return path.join(this.homeDir, '.bashrc');
    }
    /**
     * Generate .bashrc configuration content
     *
     * @param completionsDir - Directory containing completion scripts
     * @returns Configuration content
     */
    generateBashrcConfig(completionsDir) {
        return [
            '# OpenSpec shell completions configuration',
            `if [ -d "${completionsDir}" ]; then`,
            `  for f in "${completionsDir}"/*; do`,
            '    [ -f "$f" ] && . "$f"',
            '  done',
            'fi',
        ].join('\n');
    }
    /**
     * Configure .bashrc to enable completions
     *
     * @param completionsDir - Directory containing completion scripts
     * @returns true if configured successfully, false otherwise
     */
    async configureBashrc(completionsDir) {
        // Check if auto-configuration is disabled
        if (process.env.OPENSPEC_NO_AUTO_CONFIG === '1') {
            return false;
        }
        try {
            const bashrcPath = this.getBashrcPath();
            const config = this.generateBashrcConfig(completionsDir);
            // Check write permissions
            const canWrite = await FileSystemUtils.canWriteFile(bashrcPath);
            if (!canWrite) {
                return false;
            }
            // Use marker-based update
            await FileSystemUtils.updateFileWithMarkers(bashrcPath, config, this.BASHRC_MARKERS.start, this.BASHRC_MARKERS.end);
            return true;
        }
        catch (error) {
            // Fail gracefully - don't break installation
            console.debug(`Unable to configure .bashrc for completions: ${error.message}`);
            return false;
        }
    }
    /**
     * Remove .bashrc configuration
     * Used during uninstallation
     *
     * @returns true if removed successfully, false otherwise
     */
    async removeBashrcConfig() {
        try {
            const bashrcPath = this.getBashrcPath();
            // Check if file exists
            try {
                await fs.access(bashrcPath);
            }
            catch {
                // File doesn't exist, nothing to remove
                return true;
            }
            // Read file content
            const content = await fs.readFile(bashrcPath, 'utf-8');
            // Check if markers exist
            if (!content.includes(this.BASHRC_MARKERS.start) || !content.includes(this.BASHRC_MARKERS.end)) {
                // Markers don't exist, nothing to remove
                return true;
            }
            // Remove content between markers (including markers)
            const lines = content.split('\n');
            const startIndex = lines.findIndex((line) => line.trim() === this.BASHRC_MARKERS.start);
            const endIndex = lines.findIndex((line) => line.trim() === this.BASHRC_MARKERS.end);
            if (startIndex === -1 || endIndex === -1 || endIndex < startIndex) {
                // Invalid marker placement
                return false;
            }
            // Remove lines between markers (inclusive)
            lines.splice(startIndex, endIndex - startIndex + 1);
            // Remove trailing empty lines
            while (lines.length > 0 && lines[lines.length - 1].trim() === '') {
                lines.pop();
            }
            // Write back
            await fs.writeFile(bashrcPath, lines.join('\n'), 'utf-8');
            return true;
        }
        catch (error) {
            // Fail gracefully
            console.debug(`Unable to remove .bashrc configuration: ${error.message}`);
            return false;
        }
    }
    /**
     * Install the completion script
     *
     * @param completionScript - The completion script content to install
     * @returns Installation result with status and instructions
     */
    async install(completionScript) {
        try {
            const targetPath = await this.getInstallationPath();
            // Check for bash-completion package
            const hasBashCompletion = await this.isBashCompletionInstalled();
            // Check if already installed with same content
            let isUpdate = false;
            try {
                const existingContent = await fs.readFile(targetPath, 'utf-8');
                if (existingContent === completionScript) {
                    // Already installed and up to date
                    return {
                        success: true,
                        installedPath: targetPath,
                        message: 'Completion script is already installed (up to date)',
                        instructions: [
                            'The completion script is already installed and up to date.',
                            'If completions are not working, try: exec bash',
                        ],
                    };
                }
                // File exists but content is different - this is an update
                isUpdate = true;
            }
            catch (error) {
                // File doesn't exist or can't be read, proceed with installation
                console.debug(`Unable to read existing completion file at ${targetPath}: ${error.message}`);
            }
            if (!(await FileSystemUtils.canWriteFile(targetPath))) {
                throw new Error(`Path is not writable: ${targetPath}`);
            }
            // Ensure the directory exists
            const targetDir = path.dirname(targetPath);
            await fs.mkdir(targetDir, { recursive: true });
            // Backup existing file if updating
            const backupPath = isUpdate ? await this.backupExistingFile(targetPath) : undefined;
            // Write the completion script
            await fs.writeFile(targetPath, completionScript, 'utf-8');
            // Auto-configure .bashrc
            const bashrcConfigured = await this.configureBashrc(targetDir);
            // Generate instructions if .bashrc wasn't auto-configured
            const instructions = bashrcConfigured ? undefined : this.generateInstructions(targetPath);
            // Collect warnings
            const warnings = [];
            if (!hasBashCompletion) {
                warnings.push('⚠️  Warning: bash-completion package not detected', '', 'The completion script requires bash-completion to function.', 'Install it with:', '  brew install bash-completion@2', '', 'Then add to your ~/.bash_profile:', '  [[ -r "/opt/homebrew/etc/profile.d/bash_completion.sh" ]] && . "/opt/homebrew/etc/profile.d/bash_completion.sh"');
            }
            // Determine appropriate message
            let message;
            if (isUpdate) {
                message = backupPath
                    ? 'Completion script updated successfully (previous version backed up)'
                    : 'Completion script updated successfully';
            }
            else {
                message = bashrcConfigured
                    ? 'Completion script installed and .bashrc configured successfully'
                    : 'Completion script installed successfully for Bash';
            }
            return {
                success: true,
                installedPath: targetPath,
                backupPath,
                bashrcConfigured,
                message,
                instructions,
                warnings: warnings.length > 0 ? warnings : undefined,
            };
        }
        catch (error) {
            return {
                success: false,
                message: `Failed to install completion script: ${error instanceof Error ? error.message : String(error)}`,
            };
        }
    }
    /**
     * Generate user instructions for enabling completions
     *
     * @param installedPath - Path where the script was installed
     * @returns Array of instruction strings
     */
    generateInstructions(installedPath) {
        const completionsDir = path.dirname(installedPath);
        return [
            'Completion script installed successfully.',
            '',
            'To enable completions, add the following to your ~/.bashrc file:',
            '',
            `  # Source OpenSpec completions`,
            `  if [ -d "${completionsDir}" ]; then`,
            `    for f in "${completionsDir}"/*; do`,
            '      [ -f "$f" ] && . "$f"',
            '    done',
            '  fi',
            '',
            'Then restart your shell or run: exec bash',
        ];
    }
    /**
     * Uninstall the completion script
     *
     * @param options - Optional uninstall options
     * @param options.yes - Skip confirmation prompt (handled by command layer)
     * @returns Uninstallation result
     */
    async uninstall(options) {
        try {
            const targetPath = await this.getInstallationPath();
            // Check if installed
            try {
                await fs.access(targetPath);
            }
            catch {
                return {
                    success: false,
                    message: 'Completion script is not installed',
                };
            }
            // Remove the completion script
            await fs.unlink(targetPath);
            // Remove .bashrc configuration
            await this.removeBashrcConfig();
            return {
                success: true,
                message: 'Completion script uninstalled successfully',
            };
        }
        catch (error) {
            return {
                success: false,
                message: `Failed to uninstall completion script: ${error instanceof Error ? error.message : String(error)}`,
            };
        }
    }
}
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